The SART should provide a（）indication of its correct operation and should also inform survivors when it is interrogated by radar.<br>A:sight or sound<br>B:seeing or sounding<br>C:visual or audible<br>D:seeing or hearing

The SART should provide a（）indication of its correct operation and should also inform survivors when it is interrogated by radar.
A:sight or sound
B:seeing or sounding
C:visual or audible
D:seeing or hearing

出自：海船船员证

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